Kerosene-gas-burning furnace



C. A. HILLL KEROSENE GAS BURNING FUHNACE. APPLICATION HLEn'Nov.7,1919.

1,352,063. Patentedsept. 7, 1920.

2 -S l. 4C. 55%. l. SHEETS HEET INI/NTOR.

WI TNESS:

C. A. HILL.

KEROSENE GAS BUR NING FURNACE.

APPLICATION FILED NOV. 7, 1919.

Patented Sept. 7, 1920.

HEET 2.

2 SHEETS-S l '-INVENToig. L sa 62.

M MV ATToRNEx/M WITNESS:

UNITED STATESPATENT OFFICE.

CLARENCE A. HILL, OF COLUMBUS,

nro, assrcNoa To 'ri-m CHAMPION KEaosENn- BURNER COMPANY, or KENTON, OHIO, A

CORPRATION OF OHIO.

1,352,063, Specification of Letters Iatent.

Application filed November 7, 1919.

To all whom t may conce/m:

Be it known that I, CLARENCE A. HILL, a `citizen of the United States, resiuing at Columbus, in the county of Franldinand State of Ohio, have invented certain new and useful Improvements in Kerosene-Gas-Burning Furnaces; and I hereby declare that the followingV is a full, clear, and exact description thereof, reference being had to the accompanying drawings, which form part of this specification. y,

This invention relates to kerosene gas generators and burning furnaces of the type disclosed in the application of Louis F. Bertrau, (Case 6326), filed May 2,1919, Serial No. 294,274, and my application (Case 6370), filed October 11, 1919, Serial No. 330,061.

The objects of the present invention are to prevent back fire in the mixing tube of the generator by conduction of heat from the furnace; and to impro-ve and simplify the connection between the-mixing tube of the generator and the furnace. It has been found in Operating furnaces constructed as illustrated in the aforesaid applications, thatwhen such a furnace is operated for a long period of tiine'the heat in the furnace is gradually conducted back through the supply pipe to the mixing tube, 'and in time the mixing tube becomes so hot as to'actually ignite the gaseous mixture-in this tube, thus causing back-fire therein and requiring temporary stopping of the furnace.

I have Vfound after many attempts to overcome this trouble, and by a long series of tests, that by yprotecting the inlet tube to the furnace and the elbow connecting lsuch tube with the supply pipe leading to the mixing tube, this objectionable back-firing can be effectively prevented, even'when the furnace is operated continuously for many hours. y

In the accompanying drawings I have illustrated a practical embodiment of the invention and will describe the same with reference thereto, and then set forth in the claims the Vessentials of the invention and novel features and constructions, for all of which protection is desired.

YIn said drawings: f

Figure 1 is a side elevation of a furnace with a generator such as is shown in my aforesaid application, connected therewith, and provided with novel means for preventlPatcnted Sept. 7, 1920.

Serial No. 336,376.

ing overheating of and back-firing in the mixing tube by reason of the heat generated in the furnace.

Fg, 2 isan enlarged vertical section show.- ing the connection between the mixing tube and the furnace, and the heat insulating' means, Y

Fig. 3 is a plan view Figs. 1 and 2.

4 is a top plan view of Fig. 3. Y '11g'. 5 is a top plan View of a modified construction of cup used where the heated gases are to be introduced horizontally inof the cup shown in stead of 'vertically into a furnace.

F 1g. 6 is a part side elevation section of Fig. 5, showing the cup tion.

The furnace 5 (Fig. l) may be construct-- ed substantially as shown and described in the aforesaid applications; and connected therewith is a hydro-carbon gas generating apparatus, such as described in my aforesaid application, comprising in brief a generating coil 1, surrounding a back pressure gas chamber 2, and protected by a hood G; the generating coil being connected to a fuel supply pipe 1h at its lower end, and to a jet head 1 at its upper end; said jet head discharges into a mixing tube 4, which has a and part in eleva- Ylateral connection 4b with the inlet 2a of the chamber 2; and said mixing tube is connected by a pipe 4X, and elbow 4C, to a pipe 4, which enters the furnace 5, as described in the aforesaid applications. The furnace 5 is preferably provided with an outer metallic casing 5C, vand is interiorly lined with lire clay, asbestos cement, or other highly refractory and preferably non heat conducting material, indicated at 5b. lThe aforesaid parts are or may be all constructed substantially as described in the aforesaid applications and are not specificallyl claimed herein.

As stated the heat in the furnace chamber 5a is so great that in such a furnace as heretofore constructed, when the furnace is operated the heat is eventually transmitted from the pipe 4d to elbow 4c and back through the pipe 4X to the mixing tube 4, which .eventually becomes so hot as to be apt to ignite the mixture therein, causing back-firing and necessitating temporary stoppage of the furnace and restarting thereof.

In the present invention I prevent such back-firing by providing, at the upper outer surface of the casing 5,

end of the opening for pipe 4d in the wall of the furnace, a chamber or recess 6; and exterior Vto this chamber an opening is cut in the metal jacket 5c, and around this opening is fitted a hollow member or cup 7, which is of much larger diameter than the pipe 4X, or 4, and is sulicicntly large to siii'- round the elbow 4", which is spaced on all sides from the walls of the cup. rIhe cup may have a flange 7, to fit against the outer and be provided with perforated lugs 7C for the passage of retaining boltsor rivets by which the cup may be fastened tothe casing 5C. The'cup has a lcollar 7b on its inner end to it the opening in the casing 5.

The interior of this cup forms a continuation of the chamber 6 and the cup and chamber are lilled with a packing 8 of airy suitable non heat conducting material, which packing surrounds the upper end of the pipe 4d, the elbow 4", and the end ofV pipe 4 connected therewith.'

T he cup 7 preferably has a vertical slot 7 in one side to permit the ready positioning of the pipe 4X, elbow, and pipe 4d. after the cup has been attached to the casing; or to permit the pipes and elbow to be detached from the furnace, if desired, without having to detach the cup.

It will be seen by reference to the drawings that tlie elbow 4c and the connected threaded ends of the pipes 4'1 and 4X are entii'ely surrounded by thernon heat conducting packing and I have found by severe tests that with this construction the transmission of heat from the furnace chamber 5n back to the mixing tube 4 is so eifectually checked that the furnace can be operated indefinitely at full capacity without any back-firing resulting from overheating of the pipe 4", or the mixing tube.

vIf it is desired to introduce the pipe k4d horizontally into the furnace 5, the'V construction shown in Figs. 5 and 6 may be used. In this case the cup 9 substantially conforms to the Vcup already described, and is open at top but closed at bottom, and has an opening at one side and adjacent this opening a flange 9n provided with perforated lugs 9c for the passage of securing bolts or rivets. The cup 9 as shown also has an inner collai' 9b engaging the opening in the side of the casing 5. rIhe chamber 6 is formed in the side wall of the furnace, and connectswith the interior of the cup as described. rIhe Ycup 9 also has a slot 9e in one side for the entry of the pipe 4*, the elbow 4c being contained within the cup, and the pipe elbow and the connections to the pipe ends thereof are insulated from the cup and protected by a packing 8 of non heat conducting material,

. as described.

I do not consider theinvention restricted'` to the speciiiccups shown, andthesemay be:

modified to suit the particular application and mode of introduction of pipe 41 into the furnace. M i

What I claim is:

l. In combination, a furnace having an opening in its wall for the reception of a fuel gas supply pipe; a hydrocarbon gas generator having a mixing tube, anda supply pipe for conducting the mixture from this tube having an elbow and extending into the furnace through said opening; with a cup connected to the furnace and surrounding said opening and inclosing the elbow, and a non heat conducting packing within this cup around such elbow,substantially as described.

2. In combination, a furnace having an opening in its wall for-the entry of a fuel gas supply pipe andan enlarged'chamber at the outer end of said opening; a hydrocarbon gas generator having a mixing tube, and a pipe connected with said tube having an elbow and extending into the furnace to conduct the mixture thereinto; with a cup connected tothe furnace and surrounding the elbow, and a non heat conducting packing within this cup inclosing such elbow, substantially as described.

3. The combination of a furnace having an opening in its wall for the reception of a fuel gassupply pipe; and a hydroicarbon gas generatorV having a mixing tube, a pipe for conducting the mixture from this tube, an elbow connected with this pipe, and a supply pipe-connected with the elbow extending into the furnace through saidr opening' with a cup connected to the furnace and Asurrounding said opening and inclosing the elbow and the threaded ends of the' pipes connected therewith; and a non heat conducting packing within this cup around such elbow and the ends of the pipe connected therewith, vsubstantially as described.

4. The combination of a furnace having an opening in its wall for the entry of a fuel gas supply pipe; and an enlarged chamber at the outer end of said opening; and a hydro-carbon gas generator having a mixing tube, a pipe for conducting the mixture from this tube, an elbow connected with this pipe, and a pipe connected with the elbow extending into the furnace to conduct the mixture thereinto; with a cup connected to the furnace and surrounding the elbowk and the threaded ends of the pipes connected therewith, and nonfheat conducting packing'within this cup inclosing such elbow, and the threaded ends of the pipe connected therewith, substantially as described.

5. In combination, a furnace having an opening in its wall for the reception of a fuel gas supply pipe ,La hydrocarbon gas generator having a mixing tube, and a supply pipe for conducting the mixtureV from this tube having an elbow and extending into the furnace through said opening; with a cup connected to the furnace and Surrounding said opening and ineiosing the eibow, said cup having a siot in its side for the accommodation of the said pipe and an opening communicating with the opening in the wai of the furnace; and a non heat conducting packing within this cup around such elbow, substantiaily as described.

6. In combination, a furnace having an opening in its waii for the entry of a fuel gas supp-Iy pipe and Aan enlarged chamber at the outer end of said openingl and a u c a n hydro-carbon gas generator having a mixing tube, and a pipe connected with said tube having an elbow and extending into the furnace to conduct the mixture thereinto; with a cup connected to the furnace and surrounding the eibow, said cup having a slot in its side for the accommodation of the said conducting pipe and an opening communicating with the chamber at the outer end of said opening, and a non heat conducting packing within this cup inclosing such elbow, substantially as described.

In testimony that I claim the foregoing as my own, I aHiX my signature.

CLARENCE A. I-IILL. 

